Keystones — Capstone
Five GCSE retrieval questions · 10 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - 9x + 3
Answer: (x - 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 52°. Give your answer to 2 decimal places
Answer: 239.95cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 66, 58, 84, 99, 70, 13, 87
Answer: Mean = 68, Median = 68.5, Range = 86